2 FUNCTIONALLY DIFFERENT SYNERGIES DURING ARM REACHING MOVEMENTS INVOLVING THE TRUNK

被引:106
作者
MA, S
FELDMAN, AG
机构
[1] INST READAPTAT MONTREAL, CTR RECH, MONTREAL, PQ H3S 2J4, CANADA
[2] CONCORDIA UNIV, DEPT EXERCISE SCI, MONTREAL, PQ H4B 1R6, CANADA
[3] UNIV MONTREAL, INST GENIE BIOMED, MONTREAL, PQ H3C 3J7, CANADA
关键词
D O I
10.1152/jn.1995.73.5.2120
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
1. To address the problem of the coordination of a redundant number of degrees of freedom in motor control, we analyzed the influence of voluntary trunk movements on the arm endpoint trajectory during reaching. 2. Subjects made fast noncorrected planar movements of the right arm from a near to a far target located in the ipsilateral work space at a 45 degrees angle to the sagittal midline of the trunk. These reaching movements were combined with a forward or a backward sagittal motion of the trunk. 3. The direction, positional error, curvature, and velocity profile of the endpoint trajectory remained invariant regardless of trunk movements. Trunk motion preceded endpoint motion by similar to 175 ms, continued during endpoint movement to the target, and outlasted it by 200 ms. This sequence of trunk and arm movements was observed regardless of the direction of the endpoint trajectory (to or from the far target) or trunk movements (forward or backward). 4. Our data imply that reaching movements result from two control synergies: one coordinates trunk and arm movements leaving the position of the endpoint unchanged, and the other produces interjoint coordination shifting the arm endpoint to the target. The use of functionally different synergies may underlie a solution of the redundancy problem.
引用
收藏
页码:2120 / 2122
页数:3
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